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Fingering

b. 27-28

composition: Op. 10 No 12, Etude in C minor

Fingering in A

Fingering in FE (→GE)

Fingering in EE

Our variant suggestion

..

Bar 27 is one of two bars in which the fingering is already included in A. It was repeated and completed in FE (→GE,EE), yet with one exception – the last digit in A is written under the penultimate note and in the editions – under the last one. According to us, the engraver's error is a more possible explanation than Chopin's correction. Therefore, in the main text we consider both possibilities, however, we give preference to the undoubtedly authentic version of A.
In EE one digit was added. 

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Authentic corrections of FE

b. 29-32

composition: Op. 10 No 12, Etude in C minor

No fingering in A

Fingering in FE (→GE

Fingering in EE

..

In the main text we give the undoubtedly authentic fingering of FE (→GE). Fontana completed it in EE in bar 32 after bar 28.

category imprint: Differences between sources

issues: EE revisions , Authentic corrections of FE

b. 34

composition: Op. 10 No 12, Etude in C minor

Fingering in A

Fingering in FE (→GE,EE

..

Three fingering digits of A were added by Chopin in a proofreading of FE (→GE,EE).

category imprint: Differences between sources

issues: Authentic corrections of FE

b. 34-36

composition: Op. 10 No 12, Etude in C minor

No fingering in A

Fingering in FE (→GE

Fingering in EE

..

In the main text we give the fingering added by Chopin in a proofreading of FE (→GE). In EE Fontana added it in bar 35 in order to eliminate any possibility of the use of erroneous fingering.

category imprint: Differences between sources

issues: EE revisions , Authentic corrections of FE

b. 37-39

composition: Op. 10 No 12, Etude in C minor

No fingering in A

Fingering in FE (→GE

Fingering in EE

..

In the main text we give the fingering added by Chopin in a proofreading of FE (→GE). In EE Fontana completed it with digits which naturally stem from Chopin's indications.

category imprint: Differences between sources

issues: EE revisions , Authentic corrections of FE